Kia Stinger: Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Kia Stinger CK 2018-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Specifications

Specification

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	48.14
-20	-4	14.13 - 16.83
0	32	5.79
20	68	2.31 - 2.59
40	104	1.15
60	140	0.59
80	176	0.32

Description and operation

Description

Located in the engine coolant passage of the cylinder head, Engine Coolant Temperature Sensor (ECTS) detects the engine coolant temperature. The ECTS uses a thermistor that changes resistance with the temperature.

The electrical resistance of the ECTS decreases as the temperature increases, and increases as the temperature decreases. The reference +5V is supplied to the ECTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the resistance value of the thermistor in the ECTS changes according to the engine coolant temperature, the output voltage also changes.

During cold engine operation, the ECM increases the frequency of fuel injection and controls the ignition timing using the information of engine coolant temperature to avoid engine stalling and improve drivability.

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

1.	Switch "OFF" the ignition.

2.	Remove the ECTS (Refer to "Removal").

3.	After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 3 and 4.

Check that the resistance is within the specification.

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	48.14
-20	-4	14.13 - 16.83
0	32	5.79
20	68	2.31 - 2.59
40	104	1.15
60	140	0.59
80	176	0.32

Removal

1.	Switch "OFF" the ignition and disconnect the negative (-) battery terminal.

2.	Remove the engine cover. (Refer to Engine Mechanical System - "Engine Cover")

3.	Remove the cowl top cover assembly. (Refer to Body (Interior and Exterior) - Cowl Top Cover")

4.	Disconnect the engine coolant temperature sensor connector (A).

5.	Remove the engine coolant temperature sensor (B) from the water temperature control assembly.

Installation

•	Install the component to the specified torques.

•	Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

•	Apply the engine coolant to the O-ring.

•	Insert the sensor in the installation hole and be careful not to damage it.

1.	Install in the reverse order of removal.

2.	Replenish the engine coolant. (Refer to Engine Mechanical System - “Coolant”)

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